IMac Won't Connect to 5ghz Airport Extreme?

Hi,
Brought home a new 17" iMac (2.0, 1G Ram, Superdrive) and an Airport Extreme. I set up two networks, one for iMac and my wife's Macbook to run on the 802.11n (5ghz) of the Extreme, and the other a "g" network for the older laptops. I set this up by using the "secret" published in this month's Macworld. Turns out my iMac won't run (or even see) the 5ghz "n" network, but does see the 2.4ghz "n" network. It seems speedy enough at 2.4 but I'd like it work with 5ghz. Apple's site says the 1.83ghz iMac won't do this but that's it--I assume the 2.0ghz version will. Any help is appreciated.
Joe

Thanks for your reply. Yes, I did run that disk. I followed the instructions on the Apple site to check the Network Info utility to make sure the "n" appeared for the airport. Not sure what to do next. My wife's Macbook (which we also purchased yesterday--we made Steve very happy!) sits about four feet from my iMac and works just fine on the 5ghz band. Strange.

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Thank you for your e-mail, Duane. Yes, the airport express (hooked up to my stereo in the dining room) does receive iTunes from my G5 in the office. The light is a blinking yellow, but it still receives the signal.
Last night, I was able to get an internet signal on my eMac (with airport extreme card installed) from the VersaLink router that my G5 uses in the office!
I figured out that the eMac and G5 were obviously not communicating with each other, and went to the Airport icon on the top of both screens to make sure that the Location Names were correct. I discovered that I needed to change the G5 from the Airport Express Location (stereo)to the name of the eMac location (Master Bedroom). Then I got the network connection. I suppose to play iTunes to my stereo, I will have to change the location, again, right?
Another comment: I was rather amazed that, after at least an hour and a half phone conversation with three different technicians, no one came close to this solution. And I'm paying for technical help (two years left on a three year contract)! Evidently, it is not common knowledge that a wireless router and an airport extreme card with mini-antenna can communicate? I came close to buying an Airport Extreme Base Station because I thought that I might need it!!!
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Hi there
I just got an Airport Extreme last week, setting it up to have a dedicated 5Ghz network as well as the 2.4Ghz one...
My Mac Pro is set up to only remember the 5Ghz, to ask me to join new network and not to remember networks I join... it's also configured to require admin password to change networks... all of this is done in an effort to prevent it from joining the 2.4Ghz network, yet it still does sometimes when I reboot my Mac or the base station itself...
In addition, despite having 'Remember Networks' de-selected, it still remembers the 2.4Ghz...
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Bob Timmons wrote:
So I should name the '5Ghz network name' as the exact name as my 2.4Ghz network?
As a test, yes. That is also Apple's recommended default setting for the AirPort Extreme....designed to deliver the best performance for most users. Devices automatically choose the best connection quality this way.
It actually seems that you can't do this... going under 'Wireless Options' and trying to name the 5Ghz network with the same SSID as the 2.4Ghz results in it renaming itself after the update to the default Apple specifies (i.e, 2.4Ghz name 5Ghz)...
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I thought that I wanted to separate my N devices from the rest of the network so as to achieve max speed
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If you find 5 GHz faster at all Mac locations, then you'll have to continue to look for a way to insure that the Mac always connects to 5 GHz. As it stands, it appears that the Mac "thinks" that 2.4 GHz may be the better connection, and it may need some convincing to think otherwise.
That's true, but my understanding (and experience) is that if you connect any 'g' or 'b' devices to the 2.4Ghz network, any 'n' device will have its performance degraded... for instance, in my case, when connected to the 2.4Ghz, my Finder copies were around 3MB/s - on the 5Ghz, they were closer to 6MB/s
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You may be going on a recollection, that I share, that at one time Apple stated this would be possible:
In fact, Apple’s Time Machine Web page touted this very capability as recently as last Tuesday, as you can see from Google’s October 16 cache of the page
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